How to use trap(x,y) integral over a finite distance?

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Ayob
Ayob 2019-1-27
回答： KSSV 2019-1-28
Hi everyone,
I want to integrate over a finite distance for a set of numerical data. For better explanation, I have vectors of X=[] and Y=[], and I want to compute trap(X,Y) over a finit distance of [a,b]. For exmple, int( F(x), a,b)) is a proper function but it doesn't cover numerical data like vectors.
Unfortunatly, it is not possible for use fit any curve or limit X and Y vectors to the finite distance of [a,b] due to the considerable work that I will face.
How can I solve this problem?
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Jim Riggs
Jim Riggs 2019-1-28
Your question is confusing to me. I can't find a Matlab function "trap". Do you mean "trapz"?
Have you looked at help for trapz?

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KSSV
KSSV 2019-1-28
As you have (x,y) in hand..you can restrict your coordinates and use trapz. YOu can use inequalitties like < and > to pick yopur required region.

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